function _commerce_sagepay_decode_and_decrypt in Drupal Commerce SagePay Integration 7

Decode a returned string from SagePay.

Parameters

string $str_in: The encrypted String.

string $str_encryption_password: The encyption password used to encrypt the string.

Return value

string The unecrypted string.

1 call to _commerce_sagepay_decode_and_decrypt()

commerce_sagepay_form_redirect_form_validate in includes/commerce_sagepay_form.inc

Implements hook_redirect_form_validate().

File

includes/commerce_sagepay_utils.inc, line 95

commerce_sagepay_utils.inc Common utilities shared by all Integration methods.

Code

function _commerce_sagepay_decode_and_decrypt($str_in, $str_encryption_password) {

  // HEX decoding then AES decryption, CBC blocking with PKCS5 padding.
  // Use initialization vector (IV) set from $str_encryption_password.
  $str_iv = $str_encryption_password;

  // Remove the first char which is @ to flag this is AES encrypted.
  $str_in = substr($str_in, 1);

  // HEX decoding.
  $str_in = pack('H*', $str_in);

  // Perform decryption with PHP's MCRYPT module.
  return _commerce_sagepay_removePKCS5Padding(mcrypt_decrypt(MCRYPT_RIJNDAEL_128, $str_encryption_password, $str_in, MCRYPT_MODE_CBC, $str_iv));
}